Recently a Penn 9/0 leftie went on sale for less than 100. How rare are older (USA made) left handed 9/0.
The 9/0 lefties are fairly scarce, but are out there to be had more so than their big brothers.
I've seen lefties listed as a standard retrieve, which is common from estate sale junkies on eBay that know nothing about reels. Recognizing a lefty 9/0 is easy cause the harness is on the opposite side. Those ones not listed as lefty can usually be scooped up for less. If the 9/0 you pointed out for $100 is in nice condition, then that's a reasonable price. New in box lefty 9/0 from the 60's-70's can run you well over $200.
Ted